KalashNova

Howdy folks! Brand new to the forums and Benellis, and an amateur in the world of shotguns all around. First and foremost, yes, I did resort to using the search option, but unfortunately, I've found no definitive answers, so here goes! I just bought a Benelli Nova Tactical 18.5" w/ghost sites, and after patterning the shotgun with some standard 8 and 9 pellet 00 this weekend, I've found a want to tighten it up. So, obviously, a choke is what comes to mind. However, knowing that the Nova Tactical 18.5" barrels are not threaded, I'd have to get it threaded to install a choke. With that said, has anyone here had any success in threading the barrels in an 18.5" NT, and if so, what choke(s) did you opt to use with buckshot? Thanks in advance for the help!